Hod elevator



(No Model.) 2 Sheets-Meet 1.

H. A. HALL. HOD ELEVATOR. No. 374,791. Patented Dec. 13, 1887.

N. rzrzns. Pholo-Lilhogmpher. Wilmington. p. c.

(No Model.) 2 Sheigs-Shet 2.

'H. ALHALL. HOD ELEVATOR. No. 374,791. I Patented Dec. 13, 1887.

S u 111k I I MLF -ll UNITED STATES PATENT. OFFICE.

I HENRY A. HALL, OF NEW YORK, N. Y.

HOD-ELEVATOR.

SPECIFICATION forming part of Letters Patent No. 374,791, dated December 13, 1887,

Application filed January 7, 1887. Serial No. 223,630.

To aZZ whom it may concern:

Be it known that I, HENRY A. HALL, a citizen of the United States, and a resident of the city, county, and State of New York, have invented a certain new and useful Improved Endless Hod-Elevator, Expansible Pulley, and Driving-Gear; and I hereby declare the following to be a description of said invention in such full, clear, concise, and exact terms as to enable any skilled person to make and use the same, reference being had to the accompanying drawings illustrative thereof, wherein like letters of reference indicate corresponding parts throughout the several views.

[5 My invention includes an improved endless bod-elevator, expans'ible pulley, and drivinggear operated by foot-power.

Figure 1 is a front elevation of my improved endless hod-elevator; and Fig. 2 is a side elevation thereof, showing the application of foot-power. Figs. 3, 4, and 5 are respectively front, end, and rear elevations of my expansible driving-pulley or sprocket-wheel. Fig." 6

is a plan of my extensible pedal; and Fig. 7 is 2 a side elevation of the same, showing also a substitute means of imparting the foot-power to the driving gear.

The endless ladder consists of the ordinary parallel link-chains,V V, connected by rounds 3C h h h at regular distances apart, and traveling around pulleys supported in suitable frames stationed at the top and bottom of a building being erected. The bed is attached to the round by a hook or any of the well-known 5 means, and its position in descending is indicated by dotted lines in Fig. 2.

A A are uprights in the upper frame supporting journals a a, provided with anti-friction wheels or rollers bearing the shaft B,

0 Which carries the driving-pulleys or sprocketwheels 0 ,G. The details of their construction will be described later. The shaft B also carries the chain-wheel D, connected by the driving-chain b with the sprocket-wheel E upon the shaft F, to which foot-power is applied, as more fully described hereinafter.

The uprights H H in the lower frame hold the anti-friction journals (1 d, bearing the shaft K, which carries the pulley-wheels LL. The journals d d are fixed in a suitable frame sliding up and down between the uprights, and this motion is controlled by the racks O O,

(No model.)

attached onthe outside and working in the guide Q,- and the corresponding pinions, P P, on the shaft M, which can be turned by a wheel or crank and held by the companion dogs R R, connected together by the rod 0. These racks and pinions can be similarly applied and used on the upper frame-Work, and the endless ladder tightened by liftinginstead of pulling down, as just described.

The shaft F,before described, also carries the pinion T,rneshing with the driving gear-wheel G upon the short shaft UL Upon each side of the gear G, and hung upon the shaft U, are the pedals J I, respectively provided with the spring-ratchets f g, acting upon the teeth of the gear-wheel G. These pedals also have opposite extensions j i, fitted to receive and hold weights 0 p,adjustable to counterbalance the pedals. It is obvious that spiral springs or other well-known mechanical equivalents can be used instead of these weights for counterbalancing purposes. 1

The hand-rail S will afforda convenientsupport to the ope ratofiwho steps upon the pedals, bearing his full weight, for instance, first upon the pedal J, which is consequentlyborne down a certain distance,at the same time turning the gear-wheel G the same distance by means of the ratchet f. The operator now in the same manner bears upon the pedal I, which similarly turns the gear-wheel G another distance in the same direction by means of its ratchet g. The pedal J, meanwhile relieved 8 from pressure, is raised by its counter-weight 0 or equivalent spring into its former position again, and so the operation is repeated again and continued alternately.

The pedals above described may be consid ered as levers of the second class, using the shaft as afulcrum and raising weight by spring ratchets or pawls or eccentric cams acting automaticallyas grips on the drivinggear through power applied alternately at the op- 5 posite ends of the levers. S0 considered, I have made use in the claims following of the term automatic grip to describe and include all generic mechanical devices for the specified purpose, of which the spring ratchets ice or pawls f g and eccentric cams f 9, above described, are species or examples.

Instead of the gear-wheel G, as described, the wheel G may be used with internal gear and pinion, as shown in Fig. 7, and the pedals provided with eccentric cams f and g,operating substantially in the same manner by binding against the smooth rim of the wheel G. The cams,being eccentric,will clear themselves upon the upward movementbydropping down, and may be prevented dropping too low by simple stops,zz; or simple springs may be substituted for the stops,if necessary, to bring the cams into operating position against the rim of the wheel.

The pedals may be made extensible, as shown in Figs. 6 and 7, for the purpose of securing greater leverage by making the arms in two parts, 11 w, and providing the fixed part 12 with pins or buttons x y, placed, respectively, near the top and bottom edges, and the extensible part to with a suitable series of corresponding slots on the top and bottom edges. The increased weight of the pedals from such extensions may be easily counterbalanced by additional weights at the opposite ends j i, in

the manner already sutficiently described.

The details of construction of the expansible pulley or sprocket-wheel C is shown in the views of Figs. 3, 4, and 5. It consists of a solid wheel keyed on its shaft and provided inside, at the corners, with the solid sectors n n n n and the movable segments m m m m, in this instance carrying teeth, such as r r r r. These movable segments are set against a central cam-wheel fastened by a set-screw to the same shaft, and presenting the cams K K K K, corresponding to the movable segments m m m m. It is obvious that when this camwheel is turned in the direction indicated by the dotted arrow the sections lettered m will be moved directly outward or expanded-and the circumference of the wheel thus enlarged, and compensation thereby obtained for wear or contraction otherwise. The cam wheel may be fixed by a set-screw in the sleeve 8, and the movable sections m by set-screws t tt t, extending through the face of the wheel and working in slots '11. u u u.

Like expansible pulley-wheels without teeth or sprockets may be used advantageously in place of the pulleys L L, and it is evident that the foot-power may be applied at the bottom instead of the top of the apparatus, as shown, with slight modifications within mechanical skill in ways well known in the art. The operation in each case is the same. The expansible pulley and the pedal driving gear are intended to be used wherever the advantages obtained warrant their use.

What I claim as novel, useful, and my invention is- 1. As a motor adapted to endless hod-elevators and like hoisting and carryingmachincry, and in combination with the driving-gear thereof, a pair of treadles or pedal-levers hnng concentrically with and on each side of said driving-gear, each treadle or pedal-lever provided between power and fulcrum with automatic grips acting upon the same side of said driving-gear, in the manner and for the purpose substantially as specified.

2. As a motor adapted to endless hodelevators and like hoisting and carrying machincry, and in combination with the driving-gear thereof, a pair of treadles or pedal-levers hung concentrically upon each side of said drivinggear, each treadle or pedal-lever counterbalanced and provided between power and fulcrum with automatic grips acting upon the same side of said driving-gear, in the manner and for the purpose substantially as specified.

3. As a motor adapted to endless hod elevators and like hoisting and carrying machinery, and in combination with the driving-gear thereof, a pair of treadles or pedal-levers provided with automatic grips acting on said gear, said treadles or pedal-levers adj ustably counterbalanced and extensible, all in the manner and for the purpose substantially as specified.

4. As adapted to an endless hod-elevator and like hoisting and carrying machinery, an expansible pulley or toothed wheel composed of an essentially solid wheel fixed on the shaft or axle to form a face or outside, and provided inside with solid sector-shaped corners and movable segment-shaped arms between, eccentrically extended by a corresponding central cam-wheel loosely hung upon the same shaft or axle, said extensible'arms held in any de sired position by set-screws in radial slots in outside face-plate, and by the central camwheel being fixed in proper position upon the shaft or axle by a set-screw, all combined and co-operating in the manner and for the purpose substantially as specified.

H. A. HALL.

Witnesses:

WM. F. PYNE, Gno. W. BROWN, Jr. 

